Note 8 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended December 31,
	2023			2022
Statutory tax expense (benefit)		(21.0	)%		(21.0	)%
Increase (decrease) in taxes resulting from:
Nondeductible expenses		(0.4	)		(2.6	)
Valuation allowance		21.4			23.6
		0.0	%		0.0	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	As of December 31,
	2023			2022
	(In thousands)
Deferred tax asset:
Carrying values of ownership interests and other holdings	$	24,370		$	33,222
Tax loss and credit carryforwards		69,638			68,492
Disallowed interest carryforwards		6,613			6,891
Accrued expenses		13			47
Stock-based compensation		(3	)		180
Other		66			(106	)
		100,697			108,726
Valuation allowance		(100,697	)		(108,726	)
Net deferred tax asset	$	—		$	—

Summary of Operating Loss Carryforwards [Table Text Block]

	Total
	(In thousands)
2024	$	50,140
2025		17,408
2026		7,648
2027		15,100
2028 and thereafter		182,520
	$	272,816